Have need a new class of user (moderator)

Hi, this is my first post.  I did search in various ways for the functionality I require but found that the plugins mentioned do not exist any longer. Here are my requirements with regard to Administration.  I have implemented Elgg 1.9.7 on Linux, no core modifications (like I could anyway) and very few 3rd party plugins applied.

Admin
-Complete control, as it is currently.

Super User/Moderator:
-Can delete/update/approve any NON-admin user.
-No access to system-critical functions (update.php, etc)
-Ability to administer groups, pages, etc.

If this functionality exists, please kindly point me to the right location.  If the ability is coming in the future, please let me know.  I can limp by without it.
Any help or advice is greatly appreciated.  I'm new to Elgg, php, css, web hosting, etc.  But I'm trying! :)

Thank you